Other mistake: When Deputy Dwayne is talking to Sheriff Miguel Acosta while Acosta pours himself a cup of coffee, he picks up the coffee jug, pours his coffee and puts the coffee jug back far more quickly than is humanly possible.

Originally, the new "Ghost Face" mask was meant to be made out of human flesh that was being stretched over the killer's face, hence it distorts and resembles a "screaming face" like the original Ghost Face mask. This idea was dropped relatively early in filming. However, several scenes had already been filmed with the killer for the pilot, so in some shots, the mask is actually a CG model that's been added in over the original. (Though thankfully it's hard to tell which scenes have the digital mask).